Pump



De'c. 14 1926.

w. G. vJoHNs'roN l PUMP Filed Apul 1. 192e Y WILL/AM GJaHNSIO/v,

- PatentedDec. 14, 1926.

UNITED STATES WILLIAM G. JOHNSTON, OF PHILADELPHIA, PENNSYLVANIA.

PUMP.

Application led April 1, 1926. Serial No. 98,99l.

My invention relates to pumps of the type including a flexible diaphragm which is vibrated by a rotary eccentric. In the simple form of my invention disclosed in my copending applicationiSerial No. 83,236 filed January 23, 1926 for Letters Patent of the United States for improvement in atomizers, the movement of the eccentric is eiective upon the diaphra m only at the center of the latter,vand said diaphragm being held stationary at its circular margin, is flexed in a compound curve, due to the resistance of the margin of said diaphragm to iexure. Accordingly, such resistance minimizes the displacement of the fluid effected by the motion of the diaphragm. Therefore, it is the object and effect of this invention to increase tothe maximum, the displacement of'uid efi'ected by the vibration of the diaphragm,

or a plurality of diaphragms.

As hereinafter described, my improvement includes the interpositin, between the. pump diaphragm and the eccentric which actuates it, of a plunger substantially coextensive with the area of the diaphragm which is to be fiexed and of substantially Spherical curvature; which plunger is continually maintained in contact with the diaphragm but thearea of such contact varies to and from a'point at the axis ofA the diaphragm in accordance with the extent of 'iiexure of the latter; `substantially the entire areaV of the curved surface of the plunger beingin contact with the diaphragm in the position of maximum flexure of the latter.

The effect of suchconstruction and arrangement .is to dis lace a volume of the fluid to the'extent of t e segment of a spherehaving the spherical area of the contact established between said diaphragm and plunger; which volume is practicallyapproximately double that of the normal displacement effected without the interposition of such plunger.

Moreover, although the form of my invenv tion shown in said c'opending application includes but one pump diaphra in association with one eccentric; in a orml of my invention herein disclosed, a single eccentric is disposed in cooperative relation with a 5u plurality 'of similar diaphragms so as to render the pump thus constructedcapable of operating such plurality of diaphragms with successive displacements of the same or different fiuids duiing a single revolution ot" the eccentric. 7Ihe latter form of my invention may be utilized to progress alliquid hydrocarbon toward a burner, and simultaneously progress atmospheric air toward the same burner for mixture with Athe hydrocarbon. However, such a multiple pump may be used to simultaneously progress gasoline, lubricating oil, and water for motor cooling purposes, in a motor vehicle.

My invention includes the various novel features of construction and arrangement hereinafter more definitely specified.

In said drawings; Fig. l is a plan view of a pump conveniently embodying my invention.

Fig. II is' a vertical sectional view of said pump, taken on the line II, II in Fig.

Fig. III is a vertical sectional view of said pump, taken on the line III, III in Fig. I.

Fig. IV is a vertical sectional view, simiy lar to Fig. III, but showing a modified form of my invention including a plurality of pump chambers and diaphragms.

Referring to the form of my invention shown in Figs. I to III inclusive; the pump casing is conveniently formed of cast 0r wrought iron or steel and includes the base 1 provided with the cap 2 conveniently secured thereon by the bolts 3 and the nuts 4 andv inclosing the pump chamber 5 having the fluid 85 inlet 6 and the outlet 7 respectively controlled by the check valves 9' and 10 which are arranged to open in opposite directions but which are respectively pressed toward their seats by. the springs 11 Aand 12 abutting 90A against the removable screw. plugs 13 and 14.

As shown in Fig.' II; the upper wall of said chamberis arched so as to-bc u Wardly inclined toward said outlet 7 which 1s at the apex thereof, tok thus facilitate thel 05 discharge ofthe fluidv being pumped and particularly to permit the escape of airbubbles which may be occluded in the pumped liquid and which might otherwise lodge in the outer corners of said pump chamber 5. 1 00 The flexible diaphragm 16 which forms the lower@l wall of said pump chamber 5 is conveniently formed of a circular disk of hardened and tempered sheet steel, of the grade ordinarily employed for making saw blades. As shown, said diaphragm 16 is primarily. plane and, entirely disconnected Afrom the means by which it 1s fiexed; being supported solely at its perimeter; Said dia-V phragm restsfupon the annular ledge 17 inim said casing base l and is maintained in hermetically sealed relation with said casing y base 1 and cover 2 by the cylindrical tubular bushing 19, which is conveniently formed of bronze and which has accurately finished plane surfaces at each end and is compressed in the position shown in Fig. II by the bolts 3 and the'nuts 4 which connect the casing parts aforesaid.

The shaft 21 is provided with the coupling yoke 22 which is rigidly connected therewith, conveniently by the tapered pin 23. Said yoke comprises two radial oppositely extend' ing arms respectively provided with openings 25'for engagement with a complementary coupling member 26 on a suitable rotary driving element; for'instance, an armature shaft 27, of anlelectric motor 24, having pins 28l extending through said openings 25. Said shaft 21 is mounted to rotate in the chamber 29 of said pump base 4 and carries the eccentric 30 encircled by the roller shoe 31. The anti-friction balls 32 extend betweensaid eccentric and said shoe to permit said eccentric to be rotated, without said roller shoe, although the latter is free to rotate. The inner race ring 33 may be fixed on said eccentric 30 by the set screw 34 shown in Fig. III. The plunger 35 is interposed between said eccentric 30 and lsaid dia- 1phra m 16, and has the protuberant surface shown in Fig. IV; theV casing base 52 is provided with a plurality of caps l53 to inclose a plurality of pump chambers 5 respectively constructed and 'arranged like the single pump chamber shown in Figs. I and III. In Fig. IV, a circular series of diaphragme 16, each entirely independent of the means by which it is flexed, and supported solely at its perimeter, as above described, from' respective walls of the circular series lof said relation withthe axis of the shaft 21; so as to render a pump thus constructed capable of operating such plurality of diaphragms with successive displacements of the same or different fiuids during a single revolution of the eccentric 30. However, in eitherform of my invention'the race rings 37 and 38 may have theirouter surfaces eccentiic to the axis of said shaft 21and be rotatably adjusted to cause said eccentric 30 .tooperate differently upon the diaphragms 16. .l

It is to be particularly noted that each of said diaphragms 16, being formed of a disk of resilient plane sheet metal, is capable of restoring itself to-the position shown in Figs. II, III and IV, after each Hexure thereof, although it is supported entirely independently of the means 35 etc., by which it is 36'w ich may be substantially spherical or' flexed. Therefore, myI device is distinguished conodial and have its apex in coaxial relation with said diaphragm 16 and be maintainedcontinually in contact withthe latter. However, Vthe area of such contact varies in accordance with the position of rotation of said eccentric 30 and consequent extent of lexure of said diaphragm, which is effected by rotation of said eccentric, to vary the `volumetric capacity of said pump chamber 5 and thereby alternately operate said, check valves 9 and 10 by iiuid thus inlet and discharged with respect to said chamber.

As above contemplated; the rise of the curvature of said surface 35 is of substantially the same extent as the eccentricity of said eccentric 30 with respect to the axis ,ofsaid shaft 21, for instance, one sixty-fourth of an inch; s o that, in the extreme radial position of said eccentric 30 toward said diaphragm 16, the latter is flexed throughout its area to the configuration of said protuberant surface 35. f

Said shaft 21 is conveniently journaled in the ball bearings comprising the inner races 37 and 38, which are 'carried by `said'shaft 21, and outer races 40 and 41, for the balls 42 and 43. Said race 40 is adjustably se-` cured in said base 1 by the set screws 45 and 46,- and said race 41 is similarly secured by the set screws 48 and 49.1

Said chamber 29 is preferably packed with lubricant grease which is retained by the cir.

cular closures 50 and 51 which may be push fitted in suitable seats in said casing base 1.

In the modified form of my invention in that respect from structures of the prior art, wherein diaphragms are formed of iexible material such as leather which is incap- `able of vrestoring itself to plane form' by itsv own resilience, but whichvmust be supported by the flexing means so thatit ma be ositively shifted in alternatelyroppositey directions. Such nonresilient dia hragms of the prior art must be perforate l extension therethrough of the means by which they are connected to the device for iiexing them. Therefore, my invention is further distinguished from such devices ot the prior art, in that my diaphragms are imperforate". l

Therefore, to the precise details of construction and ar- `rangement; herein set forth, as' it is obvious that various modiications may be made 15 therein withoutA departing from the essential features of' my invention, as defined in the appended claims.

1. In a pump the combinationl with a casing, inclosing a plurality of pum' chambers each having a fluid inlet and a d) respectively controlled by check v alves,ar ranged 'to open in opposite directions of exible diaphragms respectively forming walls of said, pump chambers in a circular series; a rotary shaft in symmetrical relation with said series of pump diaphragms and carrying an eccentric; a roller encircling said eccentric; and plungers respectively interposed between said eccentric and said diaphragms,

to permit 'the l pump chambers 5 and normally in concentric lon I do not desire to limit myself uid outlet,

each having a substantially spherical surface opposed to said diaphragme and in contact therewith, arranged to ex said diaphragms by rotation of said eccentric and thereby alternately operate said check valves, in the respective pump chambers, by 'fiuid thus inlet and discharged with respect to said chambers; eccentric bearings for said shaft, ad-

. justably rotatable in said casing to vary' the position of the axis of said shaft with reference to said series of diaphragme; and an electric motor directly connected with said shaft.

2. In a pump; the combination with a casing, inclosing a lurality of pump chambers each having a uid inlet and a fluid outlet, respectively controlled by check valves, arranged to open in opposite directions of flexible diaphragme respectively forming walls of said ump chambers; means sup' porting said diaphra ms entirely independently of the means or flexing the same; a rotary shaft in symmetrical relation with saidpump diaphragms and carrying an' eccentric; a roller encircling said eccentric; and plungersA respectively interposed between said eccentric and said diaphragme, each having a curved surface opposed to said diaphragms' and in contact therewith, arranged to flex said diaphragms by rotation of said eccentric and thereby alternately operate said checkl valves, in the respective pump chambers, by fiuid thus inlet and discharged with respect to said chambers; eccentric bearings for said shaft,-adjustably rotatable in said casing to vary the posiv tion'of the axis of said shaft with reference' to said series of diaphragme; and an electric motor directlyl connected with said shaft. 3. In a pump; the combination with 'a leasing, inclosing a plurality of pump chambers each having a fluid 1nlet and a fiuid outlet, respectivelyl controlled by check valves, arranged toy open in `opposite direc# tions; offlexible diaphragms respectively forming walls of said pump chambers;-

means supporting said diaphragms entirely independently of the means for flexing the same; a rotary shaft in symmetrical relation with said pump diaphragme and carrying an eccentric; a roller encircling said eccentric; and plungers respectively interposed between said eccentric and said diaphragms, each having a curved' surface opposed to lsaid diaphra ms and in ycontact therewith,

arranged to ex said diaphragms by rotation of said eccentric and thereby alternately operatefsaid check valves, in the 'respective pumpachambers, by liuid thus inlet and dis- 4 charged with respect to said chambers; and

directly connected with respectively controlled by check valves, arranged to open in opposite directions; of flexible dia liragms respectively forming walls of sai pump chambers; means supporting said diaphragme entirely independently ofthe means for flexing the same; a rotary shaft in symmetrical relation with said pum diapliragms and carrying an eccentric; a rol er encirclin said eccentric; and plungers respectivel inter osed between said eccentric and said diap iragms, each having a curved surface opposed to said diaphragms and in 'contact therewith, arranged to flex 'said diaphragme by rotation of said eccentric and thereby alternately operate said check Valves, in the respective pump chambers, by liuidthus'inlet and discharged with respect to said chambers.

5. In a pump; the combination with a casing, inclosing a ump chamber having a fluid inlet and a uid outlet, respectively controlled by check valves, arranged to open in opposite directions; of a flexible diahragm forming a wall of said pump cl1am` er; means su porting said diaphragm entirely indepen ently of the means for flexing the saine; a rotary shaft carrying an eccentric; a roller encircling said eccentric; and a plunger interposed betweeen said eccentric and said diaphragm, having a substantially spherical surface opposed to said diaphragm and in contact therewith, ar-

ranged to flex said diaphragm by rotation of said eccentric and thereby alternately` operate said check valves, -in said pump chamber, by fluid thus inlet and discharged with respect to said chamber; eccentric bearings for said shaft, adjustably rotatable in said casing to vary the osition lof the axis of said shaft with re erencegto said diaphragm; and an electric motor directly connected with said shaft.

6. In a pump; the combination with a casing, inclosing a pump chamber having a fiuid inlet and a fluid outlet, res ctively controlled by check valves, arrange to open in opposite directions; of a fiexible dia- Sil liragm forming a wall of said pump cham- Eer; means'supporting said diaphragm entirely independently of the means for flexing the same; a rotary shaft carrying an eccentric; a roller encircling said eccentric; l and a plunger interposed between said eccentric and said diaphragm having a substantially spherical surface opposed to said diaphragm and in contact therewith, ar-

ran ed to fiex said diaphragm by rotation of sai eccentric and thereby alternately o er- -ate said check valves, in said pump cham er, 4by fluid thus inlet and discharged with respect to said chamber; and en electric mo- ,tor directly connected with said shaft.

7 In a pump; the combination with a cas ing, inclosing a pum chamber having a fluid inlet and a ui outlet, respectively isc ber; means s u porting saidV diaphragm entirely indepen ently of the means for lex ing'the same; a rotary shaft carry-ing an ec' .'centrie; aroller encircling said eccentric@- and afplunger interposed'between said eccentric and said diaphragm, having a substantially spherical surface opposed to lsaid diaphragm and in contact therewith', arranged to Hex said diaphragm Joy' rotation of'said eccentric and thereby `alternately operate said check valves, in said pump chamber, by fluid thus inlet and dispharged with respect to said chamber.

' 8. In a pump; the combination with a casing, inclosing -a pump chamber having a fluid inlet and a Huid outlet, .respectively ,.5- dontrolled by check Valves, arranged to open in opposite directions; of a flexible loliaphragm forming a wall of said pump chamber; means supporting said diaphragm entirely independently of the means for flexing' the same; a rotary shaft carrying' an eccentric; and a plunger interposed between said eccentric and said diaphragm, having a substantially spherical surface opposed to said diaphragm and in contact therewith, arranged to liaex said diaphragm by rotation of said eccentric and thereby alternately I.operate said check valves, in said pump chamber, by iluid thus inlet 'and discharged .with respect to said chamber.

9. In a pump; vthe combination with a casing, inclosing apump chamber having a iluid inlet and a fluid outlet, respectively controlled by check valves, arranged to open in opposite directions; of a flexible diaphragm forming a wall of said pump chamber; means supporting said diaphragm enti rely independent-ly of the means for flexing thesame; a rotary shaft carrying an ecen-..

tric; and a plunger interposed between said eccentric and said diaphragm, havinga substantially conical surface opposed to said diaphragm and in contact therewith, ar-

ranged to flex said diaphragm by rotation of 'said .eccentric and thereby alternately l nemesio operate said check valves, `Yin said pump chamber, by fluid thus inlet and discharged with respect to said chamber.v

10.` 1n a pump; the combination with acasing, inclosing a pump chamberhaving a fluid 'inlet `and a fluid outlet, res ectively controlled by check valves, arrange to o en in opposite directions; of a, flexible iaphragm forming a wall of said pump chamber; means supporting said diaphragm en- -tirely independently 'of the means for ilexingrv the same; ,a rotary. shaft carrying an eccentric; anda plunger interposed between said eccentric and said diaphragm, having a curved surface opposed to said'diaphragm and in contactntherewith, arranged to flex said diaphragm by 'rotation ofsaid eccentric and thereby alternately operate said check valves, in saidT -pump chamber, by fluid thus inlet and-'discharged with' 'respect 'to said chamber. --i t 11. Inn a pump, the combination with a casing, inclosing a pump chamber having a fluid'inle't anda liuidoutlet'; 4or a flexible diaphragm, formed of vplane'sheet metal and forming a wall'of said pump chamber, and;

means arranged to flexsaid diaphragm to a predetermined extent of its area, including a plunger having a lcurved protuberant face I opposed to said diaphragm and in contact therewith; and an\ eccentric arranged to :thrust said plunger against said diaphragm. 12. In'a pump, the combination with a l'-oasing, inclosing a pump chamber having a lluidinlet and a fluid outlet; of a ,flexible diaphragm, formed of imperforate resilient plane material and forming a Wall of said pump'chamber,and means arranged to flex said diaphragm to a' predetermined extent vof its area, including a plunger having a `curved protuberant face opposed to said diaphragm and in contact .t erewith; and means Y arranged to thrust said plunger against'-said-diaphragm.A

In testimony whereof, 'I have hereunto 'signedr'femylzname at Philadel hia, p

vania,this'f27th day" of, Maro 1926. 

